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Terminal Blocks - Headers, Plugs and Sockets is a type of electrical connectors used in a wide range of applications and have developed into various technologies over the years. From the most basic screw-type, PCB-mountable terminal block to the most complex versions with special features, they all provide a simple and reliable connection between two or more lines. This article looks at the various types of terminal block headers, plugs and sockets and how they are best used in an application.

One of the more basic versions of terminal block is the screw-type. This is a two-part device which consists of a base or mounting frame and a cap, which can be fastened securely together using a single screw. The cap has one or more contact points on it, so when the screw is tightened, electrical connectivity is ensured. These are the most basic type of terminal blocks and are commonly used in applications such as lighting or other small electrical circuits.

PCB-mountable terminal blocks are a more complex type. These have a frame or mount which is designed specifically to fit onto a printed circuit board. The main advantage of PCB-mountable terminal blocks is that they are able to make use of more contact points and therefore provide a more reliable connection. They can also mount more components on the board compared to a screw-type block. They are commonly used in industrial control systems or other larger electrical systems.

More advanced types of terminal blocks include the use of special features such as contact protection and earth continuity. Contact protection ensures that electrical arcing does not occur between adjacent contact points, while earth continuity ensures that any electronic components are safe from potentially hazardous electrical fields. These features are especially important in safety-critical applications. Other special features can be implemented as well, such as colour coding and/or sensing, depending on the application.

Regardless of the type of terminal block used, there are some key considerations to keep in mind when selecting one for an application. The main considerations are the current rating, voltage rating, contact material, insulation type and overall size. It is also important to select a terminal block with any special features that are required for the application, such as contact protection or earth continuity.

In summary, terminal blocks - headers, plugs and sockets are a type of electrical connector used in a wide range of applications. They range from the most basic screw-type terminal blocks to the most complex versions with special features. Before selecting one for an application, it is important to consider the current and voltage ratings, contact material, insulation type and overall size. In addition, any special features should also be taken into account.

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